Writing instrument



FIG. 1 is a front elevational view of a writing instrument showing our new design;

FIG. 2 is a side elevational view with the cap member removed for ease of illustration;

FIG. 3 is a rear elevational view of FIG. 2;

FIG. 4 is a top plan view of FIG. 2;

FIG. 5 is a bottom plan view of FIG. 2; and,

FIG. 6 is a front elevational view of FIG. 2. 

The ornamental design for a “writing instrument”, as shown and described. 